NUnit 2.2 Beta 1 has been released with lots of goodies like support for Mono (cool!), multiple-test selection in the GUI interface, a built-in lightweight mock object facility (yes! Yes! finally!), new command line switches for both GUI and Console runners, and new Category and Explicit attributes.
This is great news for me, as NUnit is one of those tools I always have open. I have waited awhile for this and I am glad to see development is continuing on this great product!